Alive and safe, the brutal Japanese soldiers who butchered 20,000 Allied seamen in cold blood

The perpetrators of some of the worst atrocities of the Second World War remain alive and unpunished in Japan, according to a damning new book.

Painstaking research by British historian Mark Felton reveals that the wartime behaviour of the Japanese Navy was far worse than their counterparts in Hitler's Kriegsmarine.

According to Felton, officers of the Imperial Japanese Navy ordered the deliberately sadistic murders of more than 20,000 Allied seamen and countless civilians in cold-blooded defiance of the Geneva Convention.

"Many of the Japanese sailors who committed such terrible deeds are still alive today," he said.

"No one and nothing has bothered these men in six decades. There is only one documented case of a German U-boat skipper being responsible for cold-blooded murder of survivors. In the Japanese Imperial Navy, it was official orders."